Do you know a (possibly spray) fertilizer like this one?

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Do you know a (possibly spray) fertilizer like this one?
« on: October 30, 2013, 08:10:46 PM »
I'm trying to find a (possibly spray) fertilizer with a N-P-K concentration like this one: 20-2-20 and possibly with Ca (about 20), Mg (about 10), Cu, Zn and B.
I know that it is a strange concentration, so I ask if you know a similar one, or a multiple but it is important that the N and K concentration are similar and the the P concentration is very low than N and K concentrations.
Possibly a international brand...
I will use it on Pistacia Vera and I got these concentrations basing on data found in internet.
I know it is possible to make a custom fertilizer with individual elements but I do not really understand how to make a perfect concentration with not pure products.
For example, if I have pure urea (46N) and I want a fertilizer with 20N, what have I to do?
« Last Edit: October 31, 2013, 08:56:12 AM by hereistay »
Aerospace engeneering student with a passion for plants!
I have some hectar of field with grapes and olives (my father cultivates!).
Here we have a lot of vineyards, Tollo and the near city is famous for its wines, "Cantina Tollo" is the brand of my city's wines!